<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.jpg">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click = "toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744"
          text-color="#fff"
          unique-opened
          :collapse ="isCollapse"
          :collapse-transition ="false"
          router
          :default-active = "activePath"
          active-text-color="#409BFF">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for = "item in menulist" :key = "item.id">
            <!-- 一级菜单模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级级菜单 -->
            <el-menu-item :index="'/'+subItem.path"
            @click = "saveNavState('/'+subItem.path)"
            v-for = "subItem in item.children" :key = "subItem.id">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Home',
  data () {
    return {
      // 左侧菜单数据
      menulist: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpingouwudai2',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      isCollapse: false,
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      sessionStorage.removeItem('token')
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res?.meta?.msg || '获取菜单列表失败！')
      this.menulist = res?.data || []
    },
    // 点击按钮，切换折叠菜单
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (path) {
      this.activePath = path
      sessionStorage.setItem('activePath', path)
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  color: #fff;
  font-size: 16px;
  > div {
    display: flex;
    align-items: center;
    img {
      height: 50px;
      width: 50px;
      border-radius: 50%;
      background: #eeeeee;
      margin-right:10px;
    }
  }
}
.el-container {
  background: #373d41;
}
.el-aside {
  background: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: .2rem;
}
</style>
